Found through Spillstorie.
It will be available on https://psytronik.bigcartel.com/, the coming soon entries already up in the catalogue.
Also going by the description of this edition specifically, it sounds as if users will be able to buy just the digital contents, instead of having to get a physical edition for those.
There are recompilation tools in some form; there’s a version of the C64 speech synthesiser SAM somewhere on Github that has been translated into very unreadable C code with global variables for the 6502 registers and 64K of RAM and C code that does the equivalent of 6502 instructions (I think the ST* instructions that touch the SID have been replaced with audio-writing code). For games, presumably you’d want this sort of thing with some libraries that do VIC-II graphics, SID audio, simulate hardware interrupts and such.